There is something across the field next to Gloster hill farm, visible on Google Earth, a change in the crop pattern, it is straight, position in blue below. Might be nothing of significance. I've also drawn a straight line to Chester House just for interest. The alleged location of the Altar stone is on there, some distance from the straight line to Chester house, but actually on the extrapolated blue line.
The blue line east would pass through Mariner's Court.
